<template>
<div class="comment">
    <div class="addcomment" v-show='!isFocus'>
        <input type="text" placeholder="写跟帖" @focus="focusFn" />
        <span @click="toPage" class="comment">
            <i class="iconfont iconpinglun-"></i>
            <!-- 评论数量 -->
            <em>{{ article.comment_length }}</em> 
        </span>
        <i class="iconfont iconshoucang"></i>
        <i class="iconfont iconfenxiang"></i>
    </div>
    <div class="inputcomment" v-show='isFocus'>
        <textarea v-model="content" ref='commtext' rows="5"></textarea>
        <div>
            <span @click="sendFn">发 送</span>
            <span @click="cancelFn">取 消</span>
        </div>
    </div>
</div>
</template>

<script>
import {pulish} from "@/api/news";
export default {
    props: {
        article: {
            type: Object,
            required: true
        }
    },
    data(){
        return {
            isFocus: false,
            content: "",
            parent_id: null          
        }
    },
    methods: {
        // 跳转到评论列表页面
        toPage(){
            this.$router.push({
                path: "/comment",
                query: {
                    // 传文章id到评论列表页面
                    id: this.article.id
                }
            })
        },
        // 显示多行文本域等信息
        focusFn(){
            this.isFocus = true;
            this.$nextTick(()=>{
                // this.$nextTick的回调函数是在DOM更新后触发的，因此在这里可以获取到最新DOM进行操作
                this.$refs.commtext.focus();
            })
        },
        cancelFn(){
            this.parent_id = null;
            this.isFocus = false;
            this.content = "";
        },
        // 发表评论
        sendFn(){
            let obj = {
                content: this.content
            }
            // 当parent_id存在的时候，再向obj添加parent_id属性，用来表示此刻属于回复评论
            if(this.parent_id){
                obj.parent_id = this.parent_id
            }
            pulish(this.article.id, obj).then(res=>{
                console.log(62,res);
                // 发表成功 更新评论列表
                if(res.data.message == "评论发布成功"){
                    // 因为评论列表数据在父组件中的，因此只能通过子传父技术
                    // 通知父组件此刻需要更新评论列表数据了
                    this.$emit("update");
                    this.parent_id = null;
                    this.isFocus = false;
                    this.content = "";
                }
            })
        }
    }
}
</script>

<style lang="less" scoped>
.comment{
    position: fixed;
    bottom: 0;
    width: 100%;
}
.inputcomment{
    padding: 10px;
    box-sizing: border-box;
    width: 100%;
    display: flex;
    background-color: #fff;
    align-items: flex-end;
    textarea{
        flex: 3;
        background-color: #eee;
        border:none;
        border-radius: 10px;
        padding: 10px;
    }
    div{
        padding: 20px;
    }
    span {
        display: block;
        flex: 1;
        height: 24px;
        line-height: 24px;
        padding: 0 10px;
        background-color: #f00;
        color:#fff;
        text-align: center;
        border-radius: 6px;
        font-size: 13px;
    }
}
.addcomment {
    background-color: #fff;
  width: 100%;
  box-sizing: border-box;
  padding: 10px;
  margin-top: 20px;
  display: flex;
  text-align: center;
  position: absolute;
  bottom: 0;
  left: 0;
  > input {
    flex: 4;
    height: 30px;
    line-height: 30px;
    border-radius: 15px;
    border: none;
    background-color: #eee;
    padding-left: 20px;
    font-size: 14px;
  }
  i {
    font-size: 20px;
  }
  > span {
    flex: 1;
    position: relative;
    > em {
      position: absolute;
      right: 0;
      top: -5px;
      font-size: 10px;
      background-color: #f00;
      color: #fff;
      border-radius: 5px;
      padding: 3px 5px;
    }
  }
  > i {
    flex: 1;
  }
}
</style>